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Legacy filename extensions denote binary Microsoft Word formats that are deprecated with the release of Microsoft Office 2007. Although the latest version of Microsoft Word can still open them, they are no longer developed. Legacy filename extensions include:

Legacy filename extensions denote binary Microsoft Excel formats that are deprecated with the release of Microsoft Office 2007. Although the latest version of Microsoft Excel can still open them, they are no longer developed. Legacy filename extensions include:

ACCDB – The file extension for the new Office Access 2007 file format. This takes the place of the MDB file extension.

ACCDE – The file extension for Office Access 2007 files that are in "execute only" mode. ACCDE files have all Visual Basic for Applications (VBA) source code hidden. A user of an ACCDE file can only execute VBA code, but not view or modify it. ACCDE takes the place of the MDE file extension.

ACCDT – The file extension for Access Database Templates.

ACCDR – is a new file extension that enables you to open a database in runtime mode. By simply changing a database's file extension from .accdb to .accdr, you can create a "locked-down" version of your Office Access database. You can change the file extension back to .accdb to restore full functionality.